Every transport piece moves material at belt speed and capacity (t105)

docs/DESIGN.md

@@ -98,6 +98,26 @@ Details and numbers live in the code and in `docs/systems/`.
 
 ## Decisions
 
+- **Transport matches the t45 belt (t105, 2026-10-30).** The owner approved the flat belt
+  and asked for the other transport pieces to keep the same pace and flow through mixed lines.
+  The flat belt stays unchanged: 30 cells/s, 30 grains/s with one layer and 90 grains/s with a
+  heavy feed. Straight screws and flat filters match it. Diagonal transport uses three steps
+  every eight ticks: 31.8 cells/s along its path (the integer cadence keeps four screw lanes at
+  90 grains/s). Bars follow the same distance clock. This replaces the old faster diagonal
+  screw/belt pace and slower bar-only screen pace.
+  Downhill belts and screens carry a bed six vertical grains deep, about four grains across
+  their path; the mesh holds the contact layer between steps. Screens still drop the chosen
+  grains through, with those grains waiting to sift instead of riding onto the outlet belt.
+  Uphill sidewalls keep real pushing pockets and rollback, with 10-grain cleats spaced eight
+  face cells apart and a boot scoop reaching nine cells back. Their 96-cell push bound stays.
+  Belts, filters and screws run receivers before feeders; screw mouths preserve all four lanes
+  through turns and place their output into the receiving belt's bed. Rising diagonal outlets
+  throw their load clear of the raised belt's lip, which otherwise spills it underneath. These join rules avoid
+  squeezing a full belt into one screw lane. The measured mixed chain carries about 90 grains/s
+  without growing heaps or spills. This supersedes the earlier reduced uphill/screen rates,
+  six-grain cleats and screen contact-only nudges below. World generation is unchanged.
+
+
 The newest are at the bottom. The dates are when the decision was made or built.
 
 **Up to 2026-10-19** (early design, stated by the owner): everything in "What the owner wants"